One of our favorite places to visit and we even make some reservations - like Cannon Beach RV Park - a year in advance to get a spot. We have many spots reserved for next year.
The drive on the 101 is beautiful but slow with the traffic most of the time - we go in August and Sept.
Going south is preferred as you can get into (some of) the pulloffs without crossing traffic.
So much to see. We love Cannon Beach and Ecolla State Park. But the beaches are great all along the way; we walk them a lot and well behaved dogs are allowed to run free and play all together, etc. Lighthouses to see / explore. Just too much to mention here. Get a 101 guide someplace - maybe write the State for info on that; there are some good ones out there.
Tillamook Cheese is also great for ice cream and also a great vegetable stand in town along the highway (ocean side of road).
Lots of great state parks but we prefer the private parks like Cannon Beach, Newport, Winchester Bay, Bannon, etc.
See www.LaurenBarbara.com and look under the Wanderings tab on the left for Oregon and Coast for pix.
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Enjoy !!!